On Fri, Jul 01, 2011 at 05:15:05PM +0200, Linus Walleij wrote:

There is no clean nice ADC subsystem though, and *that* feels
like a big problem to drivers like this (and no I don't like the AB8500
GPADC living in MFD either) so if you'd like to create a ADC
subsystem just go ahead, there is something in drivers/staging/iio/adc
but that had another problem last time I looked: it was only intended
for userspace control, not in-kernel use.

The other issue is that it's designed for high volume data and these
AUXADCs tend to be relatively slow.  That said I've had some discussions
with Jonathan about supporting these devices via IIO and he seems to be
coming round to the idea that we could integrate support.  Not sure how
fast IIO is progressing to mainline, though.